Molecular cloning of goat 20alpha-hydroxysteroid dehydrogenase cDNA

Walimuni Samantha Nilanthi Jayasekara, Tomohiro Yonezawa, Maho Ishida, Keitaro Yamanouchi, Masugi Nishihara

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20Alpha-hydroxysteroid dehydrogenase (20alpha-HSD), which catalyzes the conversion of progesterone to its inactive form 20alpha-dihydroprogesterone, is expressed in murine placenta and has been suggested to play roles in maintaining pregnancy. To understand the role of 20alpha-HSD during pregnancy in the goat, as a first step, cloning and sequencing of 20alpha-HSD cDNA were performed. The full nucleotide sequence of 20alpha-HSD cDNA was determined on samples obtained from the corpus luteum at the luteal phase of the estrous cycle and the placenta in late pregnancy by RT-PCR and 3 and 5 RACE systems. Cloned 20alpha-HSD cDNA consisted of 1124 bp and belonged to the aldo-keto reductase superfamily. From the start codon to stop codon there were 323 amino acids, the same as in other species. To verify whether the protein derived from goat 20alpha-HSD cDNA had 20alpha-HSD activity, the cDNA was expressed by bacteria. Bacterially expressed goat 20alpha-HSD protein showed 20alpha-HSD enzyme activity. A tissue distribution study demonstrated that 20alpha-HSD was expressed in the placenta, but not in the adrenal gland, liver and spleen during pregnancy. The present study suggests that goat 20alpha-HSD is another member of the aldo-keto reductase superfamily and that it plays a role in the placenta during pregnancy.
Original languageEnglish
Pages (from-to)323 - 331
Number of pages9
JournalJournal of Reproduction and Development
Issue number3
Publication statusPublished - 2004

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